India, July 13 -- People across central Texas, especially those in the Edwards Plateau and Hill Country need to be on high alert tonight. According to forecasters, there's a serious risk of flash flooding from slow-moving thunderstorms that are expected to drop heavy rain over the same areas for hours.

Weather experts tracking satellite data said a weather system, or "vort center," is slowly moving east through the Concho Valley and is set to reach the Hill Country overnight. This system is pulling in a lot of deep moisture from the south, especially in the mid-levels of the atmosphere. Moisture levels are high, with some areas showing values between 1.5 and 1.75 inches, enough to fuel intense storms, according to Weather Prediction Cent...